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Finding the Fourth Proportional to 99,987.94, 138,018.11 and 57,563.38

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Solution

The fourth proportional to 99,987.94, 138,018.11 and 57,563.38 is: 79,457.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    99,987.94 : 138,018.11 = 57,563.38 : x
  2. Step 2: Convert to fraction form
    99,987.94/138,018.11 = 57,563.38/x
  3. Step 3: Cross multiply
    99,987.94x = 138,018.11 × 57,563.38
  4. Step 4: Simplify right side
    99,987.94x = 7,944,788,912.81
  5. Step 5: Solve for x
    x = 7,944,788,912.81/99,987.94
  6. Step 6: Final answer
    x = 79,457.47

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.